Github user lirui-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/892#discussion_r13600111
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala ---
@@ -388,7 +386,7 @@ private[spark] class TaskSetManager(
val curTime = clock.getTime()
var allowedLocality = getAllowedLocalityLevel(curTime)
- if (allowedLocality > maxLocality) {
+ if (allowedLocality > maxLocality &&
myLocalityLevels.contains(maxLocality)) {
allowedLocality = maxLocality // We're not allowed to search for
farther-away tasks
}
--- End diff --
@mridulm , I think I got your point. Restricting the allowed locality can
help achieve some delay scheduling. Anyway, this change is meant to keep
pendingTasksWithNoPrefs from messing up the scheduling. It's better to address
this in another JIRA.
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